Coolant Boiling Into Overflow - Yamaha Raptor Forum
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post #1 of 6 (permalink) Old 05-01-2019, 07:34 PM Thread Starter
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Coolant Boiling Into Overflow

I just bought my 2005 Yamaha Raptor 660r and I have been riding it and I have changed the oil and there was already coolant in it. But when I ride the bike after I’m done it’s boiling over and this time it was coming out of the overflow hose onto the floor. Sometimes when I ride it all the coolant is also gone from the reservoir so sometimes I add some. Is there anything anyone can tell me? I’m fairly new to these thank you in advance!
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post #2 of 6 (permalink) Old 05-01-2019, 11:43 PM
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Welcome to the forum!

Unfortunately, you most likely have a blown head gasket. It will require replacement.
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'04 Suzuki LTZ400
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Last edited by QuadManiac; 05-01-2019 at 11:45 PM.
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post #3 of 6 (permalink) Old 05-02-2019, 07:11 AM Thread Starter
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Is that a big job to do or expensive? I’m new to this and I’m gonna have to do it myself. Anything you can link me or advice you can give me?
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post #4 of 6 (permalink) Old 05-02-2019, 07:21 AM Thread Starter
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I also don’t see or smell coolant coming from my exhaust.
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post #5 of 6 (permalink) Old 05-02-2019, 06:55 PM
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Download a free service manual from the stickies section. You dont necessarily have to be pushing coolant into exhaust for bad head gasket. In your case it sounds like quite the opposite. Exhaust gasses are pushing into the water jacket and creating heat and air in your coolant system causing it to boil

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07' Raptor 700- 11:1, hotcam 3, Pro design intake with K&N, +3 throttle body, Monster big bore duals, MSD with cuervo timing, JOGACA shocks, trail tech VAPOR, GYTR heel guards & bumper & nerfs, .250 aluminum skids, TM case saver, folding anodized levers and shifter, powermadd hand guards

04' raptor 660-Hot rods crank, .5mm overbore, 11:1 wiseco piston, Stage 1 hotcam, Yoshimura slip-on exhaust, K&N filter with outerwears, open lid airbox, Dynojet stage 2 jet kit
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post #6 of 6 (permalink) Old 05-10-2019, 06:03 PM
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Pressure in the cylinder is much higher than that in the water jackets... this allows exhaust gas to get past the head gasket during the power stroke, and increases pressure in the cooling system beyond that held back by the radiator cap. So, coolant gets pushed past the cap into the bottle, which overflows and, voila, eventually you run out of coolant.

Also, you'll probably see some oil get past the gasket into the water jacket too, since oil pressure is higher than cooling system pressure.
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'01 660 Raptor, Burgard +2+1 arms, YFZ Shocks, LSR anti-vibe, CTR pipe, jetted, K&N
'01 Polaris Scrambler 400, K&N
'02 Honda 400ex, Big Gun pipe, jetted, K&N, Lonestar +2 A-arms, Lonestar anti-vibe
'04 Suzuki LTZ400
'16 RZR XP4 1000 Turbo
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